Trimming mechanism for sewing-machines



APPLICATION FILED ill/2.10, 1916.

D. 8.. SEYMOUR. FRI MMJNG MECHANISM FOR SEWING MACHINES.

Patented Dec. 20, 1921.

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TRrMMhNG MECHANISM FOR SEWING MACHLNES. APPLICATION FILED MAR. 10. me.

1,400,998, Patented Dec. 20, 1921.

3 $HEETS-SHEET 2- D. S. SEYMOUR.

TRIMIVHNG MECHANISM FOR SEWING MACHiNES.

APPLICATION FILED MAR. 10, IBIS- Patented Dec. 20, 1921.

' 1341009998 3 SHEETS-SHEET 3 I 7 \V 2 A Z6 57 a In a; 16 10 J6 ammo 0 DUDLEY S. SEYMOUR- 03? 321K PARK, ILLINOIS, ASSEGNQR TU UNION SEPECIAL MACHINE COMEANY, Q CHICAG-U. ILLINOIS, A CORPC RATEGZT ILLIETOES.

TBIMMING- TJEECL.

needs-9e.

To all whom it may concern:

Be it known that l DUDLEY S. SEYMOUR i v 7 7 a citizen ot the United States. residing at Oak Perle in the county ot' Cook, State of lllinois have invented certain new and use tul improvements in Trimming Mechanism for Sowing-l\lachines of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in trimming mechanisms for sewing machines and more particularly to a trimming mechanism wherein the trimming blades operate in a substantially horizontal plane.

An object of the invention is to provide a trimming mechanism of the above character wherein the fixed blade is mounted on the presser foot and the movable blade cooperating therewith is directly mounted on an oscillating vertical shaft located in rear otthe presser bar. The vertical shaft being capable of movement upand down with the presser bar and also of endwise movement independent of the presser bar for holding the trimming members in cooperative relation with each other.

A further object oi the invention is to provide a trimming mechanism of the above character wherein the vertical shaft is oscillated by an oscillating sleeve mounted won the presser bar which oscillating sleeve receives movements from the same train of -mechanism which vibrates the needle bar.

A further object oi? the invention is to provide a trimming mechanism of the above character wherein the vertical shaft supporting the movable trimming blade cperates as a guide bar for the presscr bar.

These and other objects will in part be obvious and will in part be hereinafter more fully described.

In the drawings, which show by way of illustration, one embodiment of the invention:

Figure 1 is a view partly in section and partly in side elevation, showing a portion of a sewing machine having the improved trimming mechanism applied thereto;

Fig. 2 is a vertical sectional view through the forward end of the overhanging arm showing a portion of the operating devices for the trimming mechanism;

Specification of Letters Patent.

. Fig.1;

in isle Icon w in! C JEAUiziljlxl me.

Application filed March 10, 1916. Serial No. 83,299.

is view partly in plan and partly in section showing the presser foot and the trimming blades, the strip guard showing in part and turned to one side;

l is a sectional view on the line ll of Fig. 1;

5 is a sectio al view on the line 9-9 of Fig. l;

i Fig. 6 is a sectional view on the line -66 Fig. 7 is a vertical sectional view showing a portion of the presser bar, the sleeve surrounding the same the eccentric for oscillating the trimmer and showing the manner of supporting the sleeve in the lower bearing for the presser bar; and

Fig. 8 is adetail bartly in section showing the manner of preventing the presser bar from oscillating and the tension spring for the same. I V

The improved trimming mechanism consists of a fixed blade attached to the presser toot and movable blade which cooperates with said fixed blade. This movable blade is carried by an arm connected directly to a vertical shaft arranged in rear of the presser bar, said shaft being yieldingly pressed downwardly. to hold the blades in cooperative relation. The vertical shaft together with the trimming blades will be free to.

move up and down therefore, with the presser toot. This vertical shaft is 0scillated b a sleeve which surrounds the presser bar. i aid sleeve carricsan eccentric which is connected through suitable devices to the vertical shaft and imparts oscillation thereto. train of mechanis a from the shaft which drives the needle bar.

Referring more in detail to the drawings:

1 have shown the invention as applied to a sewing machine having a worl: support 1 avhich is preferably in the term of a suspended cylindrical arm. Said machine is also provided with an overhanging arm terminating in a head 2 the forward end thereof, in which is mounted a needle bar 8. Said needle bar is provided withneedles 4 and suitable complemental stitch forming devices located in the work support 1 and cooperate with the needles.

Mounted in suitable bearings in the overhanging arm is a shaft 5 which may be oslatedi n, any uita le War his, ha t 5 The sleeve in turn is oscillated by a the same.

m .JA.

end 's formed with a slot 12 adapted to re-' ceive the upturned edges of the fabric seclions which edges are to be trimmed and subsequently abutted and then presented to the stitching mechanism. Said presser foot is formed with a recess to receive the fixed blade 13 of the trimming mechanism. Said blade is clamped in the recess by a plate 14 held in place by a clamping screw 15. The cutting edge of the fixed member 13 is substantially in line with one side face of the slot 12.. Cooperating with this fixed blade or member 13 is a movable blade 16. Said blade is mounted onan 17 which arm is fixed to the lower end of a vertical shaft 18 by .a screw 19. The vertical shaft 18 is mounted in bearings 20 and 21 formed in the head 2. Said shaft is freely mounted in the bearings and is moved downwardly by a spring 22. This spring its lower end bears against the 17, while the upper end 0:; the spring bears against washer 23 seated in a recess 24 in the lower face of the bearing 20. Thevertical shaft 18 at its upper end passes freely through a threaded sleeve 25. This sleeve is threaded in the bearing 21 and may be moved up and down in said hearing. The presser bar 10 is provided with rearwardly projecting arm 26 which is clamped to the presser bar by a suitable screw 27. This arm is formed with an opening 28 through which the vertical shaft 18 freely passes. Said arm 26 is formed with an annular recess 29 which receives an inverted cup 30; The shaft 18 also freely passes throughthis inverted cup. A spring 31 rests on theupper. face'ofv the inverted cup and. bears at its upper end i net the sleeve 25. This spring 31 normally forces'the 26 d'ovmwardly and this arm being; rigid with the prcsser bar vieldingly holds the presser feet against the worlr supporting 1. The vertical. shaft 18 becomes a guide bar for the presser bar 10 and prevents 518 presser bar from oscillating in its s I bearings as a result of the trimming action. The vertical shaft 16, however is not under tension except from the spring 22 which. moves the same downwardly and holds the movable trimminpg blade in contact with the fixed trimming blade. As the presser foot is raised or lowered, the vertical haft 18 will move Thetension of the presser-bar spring '31 may be increased by moving the threaded sleeve 25 downward y in the support ng bearing 21 and the tension may be a suitable clamping screw.

a 1 ,eoosea decreased by a reverse movement of the threaded sleeve.

Projecting laterally from the shaft 18 is an arm 32 whichcarries a ball stud 33 on its outer end. A sleeve 34 surrounds the presser bar 10 and said sleeve extends 1 through the lower bearing 35 formed in the head 2 for the presser bar 10. A-col lar 36 secured to the lower end of the sleeve holds the same from upward movement through the bearing, and a shoulder 37 formed on the sleeve holds the same from downward movement through the bearing. On the upper end of the sleeve there is an eccentric 38. An eccentric strap 39 cooperating with this eccentric 38 engages the ball stud 33 so that as the eccentric 38 is oscillated the shaft 18 will be inturn oscillated. This eccentric 38 has its outer face transversely curved and fits a similarly curved recess in the eccentric strap so that the outer end of the eccentric strap may move up and down without disturbing its connection with the eccentric. This is to permit the vertical shaft 18 to move up and down with the presser bar without interfering with its connection with the sleeve 34 which does not have a vertical movement.

The sleeve 34 is provided with an arm 40. The shaft 5 carries a second rm 41'. This arm 41 is connected by a link 42 to one arm of a rock lever 43. The rock lever 43 is mounted on suitable cone bearings 44 and 45. The cone bearing 45 is preferably formed integral with a supporting stud 46 which extends through a thickened portion 47 of the overhanging arm 48 of the machine. Said stud is clamped to the overhanging arm by a nut 49. Theouter cone bearing 44 is adjustable and is held in adjusted positions by a nut 50.

The arm 52 of the rock lever extends downwardly and is connected by a link to the arm 40. As the shaft 5 oscillates, the arm 41.,

through the link 42 will oscillate the roclr.

lever 43 and this rock lever, through the link will oscillate the sleeve 34 and the shaft 18 and the shaft 18, in turn. will oscillate the movable trimming member.

From the above description, it will be apparent that I have provided a trimming mechanism wherein the movable blade is es cillated from a vertical shaft located in rear lO-S overhanoine' arm and consists of a comparatively short train of devices. This provides an eiiicient trimmer operating mechanism wherein there is little or no undesirable vibrations in. the operating,' parts.

It is obvious that minor changes in the details of construction and arrangement of parts, may be made Without departing from the spirit of the invention. as set forth in the appended claims.

Having; thus described my invention, what I claim as new and desire to secure by Letters latent, is

1. A. trimming mechanism for sewing machines including in combination a Work support, a presser foot havi a in die opening therethrourib, a presser bar supporting; said presser foot, a stationary trimming blade car- I ried by said presser foot in advance of said needle opening, said presser foot having a nuiidinrgslot formed therein extending from its extreme front end rearv-Jardly toward said needle opening, said stationarv blade being positioned so that its cut tins; e k with one Wall of said guidii e: slot, a vertical shaft having its axis in rear the axis of the presser bar, a movable trimming blade carried b said'shaft and coiinerating with said stationar blade, and means for oscillatii'igr said vertical shaft.

2. A trimmin mechanism for sewing machines including in combination a WOlk support, a presser foot having a needle opening therethrough, a presser bar supporting said presser foot, a stationary trimming blade carried by said presser foot in advance of said needle opening, said presser foot havinga guiding slot formed therein extending from its extreme front end rearwardly toward said needle opening, said stationary blade being positioned. so that its cutting: edge is in line with one wall of said guiding slot, a vertical shaft having its axis in rear of the axis of the presser bar, a movable trimming blade carried by said shaft and cooper sting with said stationary blade, means for yicldably moving said vertical shaft endvvise for holding): said blades in cooperative relation, and means for oscillating said vertical shaft.

3. A trimming mechanism for sewing machines including in combination Worlr support, a presser foot, a presser bar sup porting said foot, a stationary trimming blade carried by said presser foot, a vertical shaft in rear of the presser bar, the movable trimming blade carried by said shaft and cooperating with said stationary blade, a sleeve surrounding said presser bar, means for supporting said sleeve whereby the samemay be oscillated but is held. from endvvise movement relative to the prcsser bar, means for oscillating the sleeve, and means Where by said sleeve oscillates said vertical shaft.

4;. A trimming mechanism for sewing e is in line machines including in combination a Work movable trimming blade carried by said shaft and cooperating with said stationary blade, a sleeve surroundlng' SillCl presser bar, means for supporting said sleeve whereby the same may oscillate but is held from GDCl'WlSE movement relative to the presser bar, means for oscillating the sleeve, an eccentric carried by said sleeve, an eccentric strap cooperating therewith, an arm carried by said vertical shaft to Which said eccentric strap is connected. and means for oscillating said sleeve.

5. A. trimming mechanism for sewing machines, including in combination, a Work support, an overhanging arm having a supporting head at its outer end, a shaft mounted in the overhanging arm and extending into said supporting head, a vertical shaft carried by said supporting head, a movable blade carried bysaid vertical shaft, a rock lever located in said head, means for oscillating the rock lever from the first named shaft extending into the head, an oscillating member, means for oscillating said member fr 111 said rock lever, and devices operated by said oscillatingmember for oscillating; said vertical shaft.

6. A trimming mechanism including in combination, a Work support, an overhang ing arm, a supporting head at the outer end of said overhanging arm, needle bar mounted in said head, shaft mounted in said overhanging arm and extending into said. supporting head for reciprocating said needle bar, a presser foot, a presser bar carrying said presser foot, a stationary trimming; blade carried by the presser foot, amovable trimming blade cooperating with the stationary blade, a vertical shaft on which said movable blade is mounted, a rock lever mounted in said supporting head, an arm carried by the first-nam d shaft, a link connecting said arm to said rock lever, and devices operated by said rock lever for 0s cillating the vertical shaft carrying the trimmer blade.

7. A trimming mechanism including in combination, a Work support, an overhangingarm, a presser foot, a presser bar can rying said presser foot, a trimming mechanism including a stationary trimming blade and a movable trimming lade, a vertical shaft carrying said movable trimming blade, said vertical shaft being mounted in bearings in rear of the presser bar, a spring surrounding said shaft carrying the movable trimming blade, an arm carried by the presser bar and arranged to be engaged by said spring whereby the spring yieldingly holds the presser foot on the 'WOl'k support,

ing arm, a presser foot, a resser bar carrying said presser foot, an arm mounted on the resser bar and promoting rearwardly therefrom, said arm having an annular groove formed therein, an inverted cup seated in said groove, a shaft extendlng ver tically through said arm and cup and free 7 to move therethrough a movable trimming blade carried by said shaft, a spring surrounding said shaft and bearing at one end against said cup, and a threaded sleevehaving an opening through which said shaft ext-ends, said sleeve bearing against the upperend of said spring for placing the same under tension and holding the resser foot yieldingly in contact with the work support.

In testimony whereof, I aflix my signature in the presenoe of two Witnesses.

I DUDLEY S. SEYMOUR. Witnesses:

S. GEORGE TATE, STEDMAN THOMAS. 

